<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <!--async="async":立即加载-->
    <!--defer="defer"：延迟加载-->
    <script  defer="defer" src="demo.js">
    </script>

</head>
<body>
用户名：<input type="text" name="username" id="username" value="jack"><br>
密码：<input type="password" name="password" value="123456"><br>
<input type="button" value="jq的get请求">
</body>


</html>